Cutter bar for lawn mowers and the like



H. GOLDBERG CUTTER BAR FOR LAWN MOWERS AND THE LIKE Aug. 8, 1950 2 Sheeis-Sheet 1 Filed Dec. 15, 1947 y M M Maya/72g:

8- 1950 H. GOLDBERG 2,518,136

CUTTER BAR FOR LAWN MOWERS AND THE LIKE Filed Dec. 13, 1947 2 Sheets-$heet 2 Patented Aug. 8, 1950 I A BAR FOR LAWN MoWERs AND THE LIKE 7 Harry Goldberg, Chicago, IlLfas'signor to Pioneer Gen E-Mctor-Co'rporation, Chicago, 111., a cor- .xporaiticn of Delaware 1 1 Application December 13, 194i, Serial'No'. 791545 CUTTER 6 Claims.

This invention relates to an improvement in cutter bars such as are used, for example, with lawn mowers.

One purpose is to provide a cutter bar of 2 wise secured, to the rest of the plate structure. It will be understood'that the above described cutter bar structure may be employed with a wide variety of mowers, and that the details of the maximum strength. 5 mowers do not, of themselves, form part of the Another purpose is to provide a cutter bar of present invention. maximum strength and lightness. In Fig. 3 I have illustrated, in vertical section, Another purpose is to simplif and economize an assembled structure in which 20 is the hollow the manufacture of such cutter bars. tubular portion of a lawn mower reel. It is pro- Another purpose is to provide a cutter bar vided with a plurality of spiders 2|, upon which which maintains a cutter edge of maximum any suitable spiraled knives 22 may be secured. rigidity and trueness. 23 somewhat diagrammatically indicates a sup- Other purposes willappear from time to time porting end plate having thickened end portions in the course of the specification and claims. 24 and 25 in which are threaded adjusting screws The invention is illustrated more or less 26 and 21, the ends of which abut against the diagrammatically in the accompanying drawings flanges iii of the cutter bar end plates. It will wherein: be understood that the cutter bar end plates are Fig. l is a plan view of the cutter bar; suitably pivoted or journaled in the supporting Fig. 2 is a front elevation of the cutter bar; end plate 23 of the lawn mower assembly. It will Fig. 3 is avertical section illustrating the cutter be understood that the connection between the bar and parts of a lawn mower to which it is applied;

Fig. 4 is an end view of the cutter bar: and Fig. 5 is a section on the line 5-5 of Fig. 1. Like parts are throughout the specification and drawings.

Referring to the drawings, I generally indicates a cutter bar bottom plate, shown as having a longitudinally extending, concavo-convex rib which preferably extends from end to end of the bar. 3 generally indicates an upper cutter bar having an upwardly offset rib or concavo-convex portion 4, also shown as extending from end to end of the bar. It is advantageous, although not necessary, to have the portions or ribs 2 and 4 define, together, a generally cylindrical strength- In the operation of my device, the above deening rib extending from end to end of the cutter scribed cutter bar structure is journaled in any bar. The parts may be connected, as at 5, by suitable lawn mower side plates or end members welding. It will be understood that any suitable which may also serve to carry or support welding, such as spot-welding, may be employed. the cutter reel itself. The cutting edge i3 of It will be observed that the upper bar includes the blade l2 ma be adjusted in relation to the a side portion 5 which is substantially shorter cutting path 30 of the knives 22 by proper setting than the side portion or flange I of the lower bar. of the screws 26 and 21. The result is an ac- For convenience in assembly and spot-welding, curate and easily supported cutter with a blade I may provide aligning apertures 8 and 9. portion which is true and rectilinear, and which Riveted, or otherwise secured, to the outwardly is properly related to the axis passing through the extending portion 1 of the lower bar I, I illusstuds 15. The screw structure shown permits a trate a cutter blade it, shown as connected by very accurate but easy and quick adjustment of rivets H. Its forward edge is upwardly curved, as the cutter bar blade toward and away from the at I Z, and. terminates in a beveled or oflset cutting path of the cutting edges of the knives 22 on the surface It. At each end of the bar thus formed reel. is an end plate M, which is provided with an I claim; utwa dly extending s d is als pr 1. In a cutter bar for lawn mowers and the Vided w a O set, u w y extcndl'ng fl e like, a formed steel cutter bar having a body of I6. The end plates l4 may be welded, or othersheet metal, said body including an upper and indicated by like symbols screws 26 and 21 and the flanges 16 may be employed to set the cutter bar structure in relation to the periphery or cutting path 30 of the cutter knives 22.

It will be realized that, whereas, I have described and illustrated a practical and operative device, nevertheless many changes may be made in the size, shape, number and disposition of parts without departing from the spirit of my invention. I therefore wish my description and drawings to be taken as in a broad sense illustrative or diagrammatic, rather than as limiting me to my precise showing.

The use and operation of the invention are as follows:

3 a lower sheet metal element extending continuousl; substantially from end to end thereof, each said element having concave-convex reinforcing ribs, spaced inwardly from the edges of the bar, and extending from end to end of the bar.

2. Thestructure of claim 1, characterized by and including concavo-convex reinforcing ribs which, together, define substantially a cylinder.

3. The structure of claim 1, characterized by and including end plates secured to the ends of 4 of which has a. pivot member outwardly extending therefrom.

6. The structure of claim 1, characterized by and including end plates for the cutter bar, each of which has a flange extending therefrom and adapted to receive am'usting members.

HARRY GOLDBERG.

REFERENCES CITED The following references are of record in th file of this patent: i

UNITED STATES PATENTS 

